Image scanner

Details Image scanner Image scanner

1997-12-11

2000-09-19

Williams, Kimberly A.

Facsimile and static presentation processing

Facsimile

Specific signal processing circuitry

358447, H04N 140

Patent

active

061220779

ABSTRACT:
An enhancement and interpolation circuit forms enhanced image data by performing enhancement and interpolation processing on image data. A floating slice circuit obtains a floating slice level for said image data. A binarization and density conversion circuit binarizes enhanced image data using the floating slice level to form binarized image data. In the double-side read mode, simultaneously read image data on the right and reverse sides of a document are transferred at a first rate. In the one-side read mode, image data on the right side of a document is transferred at a second rate that is slower than the first rate by data transfer means. An image discriminating circuit forms an image discriminating instruction for read image data. A white level signal generating circuit forms a new white level signal by subjecting said image data and a current white level signal in accordance with an operation designation instruction corresponding to an image discriminating instruction. This new white level signal is stored as the next white level signal.

REFERENCES:
patent: 5471320 (1995-11-01), Jodoin et al.
patent: 5579419 (1996-11-01), Yaguchi et al.
patent: 5949555 (1995-02-01), Sakai et al.

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